Stabbee / Stabber
Woe, indeed. Were there a Thor and Loki ever not raised together, it truly would be tragic for everyone involved because it would mean they'd be forced to annoy everyone else instead of each other. It left to question what would it have been like were they to have been raised with Hela, too. She probably would've done that thing where she put her hands out and held them by the head so they couldn't reach each other and then stabbed them both for being idiots.
"Oh yes, all of them. And I would not even stay in the water that long so it would be entirely wasteful." Were he to see a knife pulled it would come as no shock. And neither should the summoning of his axe in retaliation. And all this over a piece of pizza (and now also the poor, innocent luxury soaps).